1，主界面

 2，效果图

 

 3，代码展示

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using AForge.Controls;
using AForge.Video;
using AForge.Imaging;
using AForge.Math;
using AForge.Video.DirectShow;
using System.Drawing.Imaging;

namespace LocalCamera
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

        }
        FilterInfoCollection videoDevices;
        VideoCaptureDevice videoSource;
        public int selectedDeviceIndex = 0;
        private void OpenCamera_Click(object sender, EventArgs e)
        {
            videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
            selectedDeviceIndex = 0;
            videoSource = new VideoCaptureDevice(videoDevices[selectedDeviceIndex].MonikerString);//连接摄像头。
            videoSource.VideoResolution = videoSource.VideoCapabilities[selectedDeviceIndex];
            videoDev.VideoSource = videoSource;
            // set NewFrame event handler
            videoDev.Start();
        }

        private void Photo_Click(object sender, EventArgs e)
        {
            {
                if (videoSource == null)
                    return;
                else
                {
                    Bitmap bitmap = videoDev.GetCurrentVideoFrame();
                     Picture1.Image = bitmap;
                   
                }
                
            }
        }

        private void CloseCamera_Click(object sender, EventArgs e)
        {
            videoDev.Stop();
        }
    }
}

4，关键引用库是这些，网上很多，可以去下载